GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/6637
[SPARK-7440][SQL] Remove physical Distinct operator in favor of Aggregate
Distinct is very similar to Aggregate, which is an important operator to
optimize for.
This patch replaces Distinct with Aggregate in the optimizer, so Distinct
will become
more efficient over time as we optimize Aggregate.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark replace-distinct
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/6637.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #6637
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commit 87e474128f30dc93fd1d1e831408d763d3913178
Author: Reynold Xin <[email protected]>
Date: 2015-06-04T08:20:30Z
[SPARK-7440][SQL] Remove physical Distinct operator in favor of Aggregate.
Distinct is very similar to Aggregate, which is an important operator to
optimize for.
This patch replaces Distinct with Aggregate in the optimizer, so Distinct
will become
more efficient over time as we optimize Aggregate.
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